Method of inhibiting algae utilizing trimethylbenzylaminoethylamine

ABSTRACT

Antimicrobial 1,2,4,5-tetrasubstituted benzenes having the structure: WHEREIN R and R&#39;&#39; may be methyl, or a halogen when R&#39;&#39;&#39;&#39;&#39;&#39; is -CH2-; or R and R&#39;&#39;, taken together, may be methylene dioxy; R&#39;&#39;&#39;&#39;may be methyl or nitro; R&#39;&#39;&#39;&#39;&#39;&#39; may be absent or may be -CH2-or -CH ; and X is the residue of a substituted amino or a polyamino radical.   D R A W I N G

United States Patent Merianos et al.

[ ]*Mar-. 18, 1975 METHOD OF INI-IIBITING ALGAE UTILIZING TRIMETHYLBENZYLAMINOETIIYLA- MINE Inventors: John J. Merianos, Jersey City;

Phillip Adams, Murray Hill, both of NJ.

Millmaster Onyx Corporation, New York, NY.

The portion of the term of this patent subsequent to June 28, 1991, has been disclaimed.

Filed: Dec. 3, 1973 Appl. No.: 421,416

Related U.S. Application Data Division ofSer. No. 130,783, April 2, 1971, N0. 3.821.407.

Assignee:

Notice:

U.S. Cl. 71/67 Int. Cl A0ln 9/24 Field of Search 71/67 [56] References Cited UNITED STATES PATENTS 3,466,162 9/1969 Gloor et al 7l/67 3,645,715 2/1972 Daum et al. 7l/67 3,771,989 11/1973 Pera et al 71/67 Primary Examiner-James 0. Thomas, Jr. Attorney, Agent, or Firm-Arthur A. Jacobs, Esq.

57} ABSTRACT Antimicrobial l,2,4,5-tetrasubstituted benzenes havwherein R and R may be methyl, or a halogen when R is CH or R and R, taken together, may be methylene d-ioxy; R"may be methyl or nitro; R may be absent or may be CH or -CH=, and X is the residue of a substituted amino or a polyamino radical.

1 Claim, N0 Drawings METHOD OF INHIBITING ALGAE UTILIZING TRIMETHYLBENZYLAMINOETIIYLAMINE Rlll x Rll wherein R and R may be methyl, or a halogen when R' is CH;; or R and R, taken together, may be methylene dioxy; R" may be methyl or nitro; R may be absent or may be Cl-l or -CH=; and X is the residue of a lower alkyl, monoor polyamino, or alkanolamino radical.

The configuration of these tetrasubstituted benzenes is mainly, but not necessarily exclusively, 1,2,4,5. For example, the chloromethylation of pseudocumene to trimethylbenzyl chloride by methods known to the art produces about 80 to 85percent of the 2,4,5- trimethylbenzyl chloride isomer; about 10-15% of the 2,3,5 isomer; and small amounts of the 2,3,6 isomer. The chloromethylation of 1,2,4-trichlorobenzene yields a similar distribution.

Halogenation of pseudocumene also results in comparable isomeric distribution; of which, for example, the 5-halo trimethylbenzene is a solid, which is easily separated from its liquid isomers.

The antimicrobial amino derivatives of the present invention will be referred to hereinafter as the principal l,2,4,5-components, with the understanding that minor amounts of the isomeric compounds may be present.

Among the intermediate agents with which the amino compounds described hereinafter are reacted to produce the products of the invention are trimethylbenzyl halides, trihalobenzyl halides, trimethylhalobenzenes, trimethyl benzaldehydes, and nitropiperonal; the halogen in each case being selected from the group consisting of chlorine, bromine and iodine.

The amino compounds which are employed in condensation reactions to yield the products of the invention are organic amines, polyamines, or alkanolamines having at least one primary amino group, such, for example, as ethanolamine, ethylene diamine, propylene diamine hydroxyethyl ethylene diamine, dimethylaminopropylamine, and the like.

The antimicrobial properties of these products or of their salts make them effective preservatives, sanitizing and disinfecting agents which are effective against bacteria, fungi and algae. They may be applied to the preservation of cosmetics and to the preservation of waterbased paints, both in the emulsion and in the applied and dried film. They may also be used in the preservation of metal working fluids such as cutting and grinding oils, to prevent putrefaction. They are, additionally,

effective for the treatment of process and cooling water in such fields as paper making and the like, and in heat exchangers, air conditioners, humidifiers and dehumidifiers and the like. They are useful for the sanitization of surfaces and, in fact, wherever an antibacterial agent may be required.

The following examples are intended to illustrate but not to limit the invention, except as claimed:

EXAMPLE 1 Pseudocumene was chloromethylated by the procedure described by R. D. Lake and B. B. Corson,'in the Journal of Organic Chemistry, Volume 24, pp. 1823-24. The washed crude was distilled to separate the unreacted residue of hydrocarbon and the small residue of bis-chloromethylated material. The 2,4,5- trimethylbenzyl chloride was obtained in about 80 percent yield.

EXAMPLE 2 cooled mass was checked for ionic chlorine content,

which was found to be of the theoretical amount.

100 m1. of 30 percent caustic soda solution was added with agitation, to liberate the product from its hydrochloride salt. 500 ml. of chloroform was added, and the contents of the flask were transferred to a separating funnel.

The chloroform layer was tapped off, and transferred to a distilling flask wherein the chloroform was stripped off and recovered.

Distillation was continued, and the product, trimethylbenzylaminoethylamine, was recovered in 95% of the theoretical amount, distilling at l22125C at 0.1 mm.

' pressure. It had an equivalent weight by titration of 98.7, the theoretical being 96. The still bottoms represented about 5 percent of the amount of active product.

The hydrochloride salt was prepared, and found to have a melting point of l72-174C.

For commercial purposes, it is not necessary to distill the product, but merely to strip off the chloroform.

EXAMPLE 3 In the same manner as in Example 2, the reaction was carried outwith, respectively, propylene diamine, 1,3-

diaminopropane, dimethylaminopropylamine, hydrox-' amine can be separated from the oily layer, and, thereafter, the water can be largely stripped off from the amine to be recovered by distillation.

EXAMPLE 4 5-chloropseudocumene was prepared by chlorinating pseudocumene in chloroform, as described in Smith and Moyles The Jacobsen Reaction, IV, in the Journal of the American Chemical Society, Volume 58, page 8 (l936), whereby 5-chloropseudocumene was separated from 3-chloropseudocumene by crystallization, the latter being liquid.

fi-bromopseudocumene was prepared similarly, brominating in chloroform and separating the crystalline S-bromopseudocumene from the 3-isomer.

EXAMPLE 5 An agitated, round-bottomed flask fitted with a reflux condenser was charged with 20 grams or 0.1 mol of the S-bromopseudocumene of Example 4 and 30 grams or 0.5 mol of ethylenediamine, plus 0.5 grams of cuprous chloride. This was heated under reflux and agitation at about 120C and atmospheric pressure for 24 hours. When bromide in titration indicated substantially complete reaction, the excess amine was stripped off, and the cooled residue was treated with 30 percent aqueous caustic soda. The product, trimethylanilinoethylamine was extracted with chloroform and washed with salt solution. The extract was filtered and stripped of chloroform, and the product was recovered as a solid melting at 22 l-225C. The yield was 85-90percent of the theoretical.

Similarly, ethanolamine substituted for ethylene diamine and reacted at l70l75C for 72 hours yielded trimethylanilinoethanol; and the amines of Example 3 in general may also be reacted.

EXAMPLE 6 1,2,4-trichlorobenzene was chloromethylated by methods known to the art; for example, by treatment with paraformaldehyde and HCl gas in 100 percent sulfuric acid; or with paraformaldehyde and chlorosulfonic acid in concentrated sulfuric acid. The separated and washed product was distilled in vacuo to separate from unreacted trichlorobenzene, to recover the 2,4,5-trichlorobenzylchloride in good yield.

EXAMPLE 7 23 grams or 0.1 mol of 2,4,5-trichlorobenzyl chloride and 30 grams or 0.5 mol of ethylene diamine were mixed and heated on a steam bath for 4 to 6 hours until titration of chloride ion indicated essential completion of the reaction. The excess of ethylene diamine was stripped off and the residue was treated with 30 percent caustic soda and extracted with chloroform.

After distilling off the chloroform, the 2,4,5- trichlorobenzylaminoethylamine was distilled.

In a similar manner, 2,4,5-trichlorobenzyl chloride was reacted with the amines of Example 3, to yield the corresponding trichlorobenzylamino derivatives.

I EXAMPLE 8 Schiff bases were prepared by reacting the amines of Examples 1 and 3 with aromatic aldehydes.

The Sommelet reaction (described by Shacklett and Smith, among others, in the Journal of the American Chemical Society, Volume 75, pages 2654-57) was used reacting the trimethyl benzyl chloride of Example 1 with a 10 percent excess of hexamethylene tetramine and with formalin, in aqueous ethanol. Yields of about 60 percent of trimethylbenzaldehyde were obtained, in accordance with Shackletts experience.

Thirty grams or 0.2 mol of the trimethylbenzaldehyde and 23 grams or 0.225 mol of dimethylaminopropylamine in 100 ml. of benzene were heated at the reflux temperature, about C, in an agitated flask fitted with a Dean and Stark moisture trap and reflux condenser for about 2 hours. The theoretical amount of water distilled out.

The benzene and the excess of amine was stripped off, leaving 44 grams or percent of the theoretical of 3-(2,4,5-trimethylbenzylidene)-ldimethylaminopropylamine as a liquid.

EXAMPLE 9 In the same apparatus, 15 grams or 0.1 mol of 2,4,S-trimethylbenzaldehyde and 3 grams or 0.05 mol of ethylene diamine were reacted in benzene, distilling out 0.1 mol of water. The product, bis (2,4,5- benzilidene)-ethylene diamine was recovered as leafy white crystals melting at ll0l 15C.

EXAMPLE 10 Other substituted benzaldehydes weres'imilarly reacted as in Examples 8 and 9; for example, 6-nitro piperonal (otherwise, 2-nitro-4, S-methylenedioxybenzaldehyde) yielded, with ethylene diamine, (2-nitro-4, 5 -methylenedioxybenzylidene)-ethylene diamine.

EXAMPLE 11 In the same manner, 6-nitropiperonal yielded 3-(2- nitro-4, 5-methylenedioxybenzylidene l dimethylaminopropylamine.

EXAMPLE 12 In the same manner as in Example 9, the nitro substituted piperonal was reacted with one half a molar equivalent of ethylene diamine to yield the corresponding bis-(-2-nitro)-4, S-benzylidene) diamine.

EXAMPLE 13 The Schiff bases of the preceding examples may be reduced, if it is so desired, to the correspondingbenzylamino derivatives; for example, by treatment with sodium borohydride in methanol, or by hydrogenation in the presence of Raney nickel.

EXAMPLE 14 The above compounds were tested for antimicrobial activity, using the Standard Tube Dilution Test, which is common knowledge to those skilled in the art. This test utilizes a suitable nutrient broth which is treated to provide various concentrations of the antimicrobial candidates of this invention.

To the sterile broth contained in test tubes at 9 ml. volume was added 1.0 ml. of a dilution of test antimicrobial solution, at levels of 1,000, 500, 250, 100, 50, 10 and 5 parts per million respectively. Following this, each tube was inoculated with 0.1 ml. of a broth suspension of a 24 hour culture of the test bacteria or fungi, to give a final bacterial count of l to 10 million organisms per ml; or a fungi count of from 10,000 to 50,000 spores per ml; or 30,000 cells per ml. for algae.

lowing Table, for the sake of brevity, the derivatives of the amines will be given asi Trimethylbenzyl =TMB; Trimethylphenyl TMP; Ethylene diamine ED; Diethylene triamine DT; Hydroxyethyl ethylene diamine HEED; Dimethylaminopropylamine DMAPA.

Table 1 Parts per million of product inhibiting:

Gram Negative Gram Positive Fungus Algae Product E.c. Ps.a. Sxa. S.f. A.n. P.e. C.p.

TMB/ED 50 100 100 50 50 S 10 TMB/DT 50 500 50 50 500 500 50 TMB/HEED 500 1000 50 50 500 500 50 TMB/DMAPA 500 I000 50 I00 I00 100 I0 TMB/DMAPA 500 1000 50 I00 100 100 10 TMB/ED 100 1000 100 500 500 I000 50 Bis TMB/ED I00 1000 100 100 100 500 50 Bis TMB/DMAPA l00 500 l0 10 100 500 10 TCB/DT I00 100 50 50 IOOO 1000 e TCB/HEED 500 lOOO 1 000 1000 l 000 1000 TCB/ED 100 250 100 100 The invention claimed is: g

1. A method of inhibiting algae which comprises applying to said algae an effective amount sufficient to inhibit the growth of said algae of trimethylbenzylaminoethylamine. 

1. A METHOD OF INHIBITING ALGAE WHICH COMPRISES APPLYING TO SAID ALGAE AN EFFECTIVE AMOUNT SUFFICIENT TO INHIBIT THE GROWTH OF SAID ALGAE OF TRIMETHYLBENZYLAMINOETHYLAMINE. 